The shooting happened outside a 24-hour deli in Paterson at about 5 a.m. Sunday.
Authorities on Monday charged Raheem Thomas with assault and weapons offenses.
Investigators say the rapper, whose real name is Willie Maxwell, and several friends, became involved in a heated altercation with another group.
Officials say the rapper was not hurt and the three victims were taken to a hospital.
There was no immediate word on the extent of the injuries to the shooting victims. The investigation is ongoing.